parsons



, R. C. PARSONS. ,FLUID PUMP, TURBINE, AND THE-LIKE.

APPLICATION FJLED JAN. 21, I920.

6 1 V 0 N d e. u S .E B R 2 SHEE}3,9T88.

n. c. PARSONS.

FLUID PUMP, TURBINE, AND'THE LIKE.

APPLICATION FILED mun. 1920. j

14,988; 2 SHEETS-SHEET 2;

Beissued Nov. 16, 1 920.

UNITED STATES T PATENT OFFICE.

RICH.AJR.D cnnnn reasons, or LONDON, ENGLAND. FLUID PUMP, runnmn, ANDTHE Linn.

14 988 Specification of Reissued Letters Patent. Reissued Nov, 16, 192QOriginal No. 1,254,158; dated January 22, 1918,Serial No. 67,521, filedDecember 18, 1915. Application 101' reissue filed January 21, 1920.Serial No. 353,040}.

To all whom it may concern: fibrous and other matters which may lodge 55Be it known that I, theHonorable RIcH- between them and the casing, therevolu- ARD CLERE PAnsoNs, M. A., M. Inst. C. E., a tion of thesucceeding resilient blades givsubject of the King of Great Britain anding successive impulses to the lod ed mat- Ireland, and residing at 39Victoria street, ter, until it is finally expelled fi-om the London, S.W., England, have invented cer-- pump. The wear of the pump by sand or60 tain new and useful Improvements in and other abrasive matter isgreatly reduced by Relating to Fluid Pumps, Turbines, and the the use ofthe rubber or like coating, it havlike, of which the following is aspecificaing'been found by experiment that rubber of ,tion.v t e qualityspecially selected is, under the This invention relates to improvementsconditions existing, less liable to abrasion 65 in centrifugal pumps,turbine type fluid than metal. I pumps, or water turbines and the like,of Referring to the accompanying drawthe type in which resilient bladesare 'emin s v plozed, lgure 1 is a-transverse section of one hencentrifugal pumps, for example,v form of pump constructed according tothe 7 0 are employed for pumping fluid containing invention; v r i sandor other abrasive matters, it is found F igs..2, 3 and 4 being similarviews of that serious abrasion of the internal parts modified forms.

takes place, with resulting great reduction a F ig.-5 is a front viewofthe pump shown of efficiency, besides giving rise to frequent in Fig. 1,the, front portion of the casing. 75 and costly repairs; and when suchpumps eing removed. l are used for pumping fluids containing Fig. 6 is aView of the front portion of .fibrous matter or the like, such matterbethe casing, as seen from the interior of the comes'wedged between theimpeller and the pump,'showing the grooves in the'face.

Surfaces against hi h it; l ,v f In carrying the invention into effect,ac- 8f quent-ly causing stoppage of the pump. cording to the form shownin Fig. 1, which, The object of the present invention is to represents acentrifugal p p of the Single overcome these difficulties. inlet type,the pump chamber is constructed The invention consists in an improved.Of two parts, a, b respectively. The backform of pump in which thevanes of the importion a contains the bearing, which is 85 peller areconstructed entirely of resilient l rica ed wi h a- Stream of water, andalso material the'face against which :it contacts an air pipe forbalancing purposes and'in also being constructed of resilient material,which works the spindle c carrying-theimwhile the passages through whichthe fluid peller d, and attached to which is the necespasses are of suchform that with the vane y r s ing hl part also con resiliency, solid,fibrou and oth m tt tainsthe outer or volute chamber e of the will pasthrough the um dily and pump, and the discharge pipe or outlet f.without blocking it. he volute chamber e is closed at the front 40 heinvention also consists in the im-. by the part b, which is connected tothe proved constructions of pumpshereinafter back portion by boltspassing through 9:

escribed. v flang s on the two parts. The center of The invention is aplicable to centrifugal he portion 6015' the pump is provided with pumpsof any of the well -known forms, a circular aperture 9, which serves asthe having unshronded impellers with ith r inlet. The impeller isconstructed in the single or double inlet. following manner :The centeris com y the use of the resilient impellers, and structed of metal whichis suitably. attached suitable grooves in the surface of the casto thespindle upon which it revolves. The ing against which they contact,according front face of this metal is provided with 50 to the invention,fibrous and the other deep grooves, following the line of the usualsolid matters are readily passed through the impeller blades, and by theuse of asuitable pump. Owing to the resiliency of the mold impellerblades h of the usual sha )0 blades, aided by the grooves in "the faceof but of rubber are formed on the face of t e the casing, these areenabled to overrun any Impeller The rubber is arranged to fill thegrooves in the front face of the impeller, these grooves beingpreferably of dovetail form, so as to secure the rubber to the metal,and preferably considerably wider than the thickness of the blades, sothat a heavy rubber root is formed, so as to allow bending of theimpeller blades without overstressing. The rubber of which these vanesare formed is allowed to extend over and to be securely cemented to theflat face of the impeller. The outer circumference of the impeller liesjust within the orifice of the delivery chamber f. Spiral grooves 70 areformed in the face of the part 1) adjacent to the impeller blades, thesegrooves being of the form illustrated in Fig. 6, and continued somedistance along the inlet pipe 9. These grooves k assist in the removalof solid particles which are swept into the grooves and then along themtoward the circumference by the rotation of the impeller blades.

In the form of the-invention illustrated in Fig. 2, which is suitablefor pumping fluids containing abrasive material, the

back casing of the pump a contains only one-half of the volute chambere, and of the outlet pipe f, the other half of each of these beingformed by'the front portion 1, so that these two portions of the frontconsist of simple castings without cores. The central opening of thepart Z of the casing is of slightly greater diameter than the impellerd, so that the latter can be withdrawn through it. This opening isclosed in by'a casting 6 having a central inlet g. The whole of theinterior surface of these parts, and the front and rear surfaces andcircumference of the impeller, are so arranged that they can be easilyrubbered over such area as may be required for any special duty, the

rubber m being simply molded on to the several parts, as illustrated.The vanes for balancing purposes at the back of the impeller may also bemade of rubber if desired.

In 'the form of the invention shown in Fig. 3, which is speciallysuitable for pumps employed in dredging, and in some mining operations,-such as pumping slimes and tailings, where the wear on the pumps is verygreat a secondary chamber or lining 'a, 0, may be provided inside theouter casmg of the pump, specially designed to easily receive the rubberfacing and constructed so that it can be easilyremoved and re-rubbered.i Another form of such a separate casing is shown at Fig. 4, the casinghere bein constructed in two parts, 0 and .n, whic are arranged tocontain the volute chamber 6. The portion of 0 against which theimpeller contacts contains grooves similar to those already described.

In this form of the invention, the parts n, 0 forming the pump chamberare mounted inside a second chamber formed by the two parts a, b, thepart of the second chamber a carrying the impeller bearings. The back ofthe propeller is provided with balancing vanes g, which rotate in thechamber formed at the back of the propeller between the two parts it and0. The inner chamber 6 is of the usual spiral form, and has all itsinner surfaces forming the fluid passages lined with rubber vulcanizedonto the two parts n, 0. The delivery orifice of the pump spiral isopposite a continuation branch with an outside flange formed on theouter chamber, the innerv chamber being bolted circumferentially to theouter chamber.

In cases where pumps are lined with hard metal plates, greatdeterioration takes place at the joints of such plates, and the casingsto which they are attached. According to my invention, I may preventthis by coating the face or edge or both ends of such plates withrubber, or by coating the casing under the plates.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is 1. centrifugal pump comprising incombination a, casing, a resilient lining completely covering the innersurface of said casing, and impeller including a rotating disk and vanesmade entirely of resilient material carried on the side of said disk, asand for the purposes described.

2. A centrifugal pump comprising in combination a casing, a resilientlining completely covering the inner surface of said casing, grooves inthe face of said, resilient lining, said grooves being in the directionof flow of 'the fluid through the pump, an impeller including a rotatingdisk and vanes made entirely of resilient material carried on the sideof said disk, as and for the purposes described. 7

3. A centrifugal pump having an impeller of disk form with blades ofresilient material laterally projecting therefrom determining .the flowof the fluid, and capable of permitof disk form with backwardly curvedblades of resilient material laterally fprojectin therefrom determiningthe flow o the flui and capable of permitting the passage of fibrous andother matters without blocking.

' 5. A centrifugal pump comprising in combination an impeller of diskform with blades of resilient material projecting from at leastone sidethereof, a casing having at least one.

inner side surface adapted to close laterally the passages between thesaid blades coacting with said impeller to deliver the impelled fluidwhile permitting the passage of fibrous and other matters withoutblocking.

6. A centrifugal pump comprising in combination an impeller of disk formwlth backwardly curved blades of resilient material projecting from atleast one side thereof, a

caslng having at least one inner side surface adapted to' closelaterally the passages between the said blades' co-acting with saidimpeller to deliver the im mitting the passage of ters without blocking.

7. A centrifugal pump comprising in com bination an impeller of diskform with brous and other matblades of resilient material projectingfrom at least one side thereof, a casing havin at least one inner sidesurface adapted to close laterally the passages between the said bladesco-acting with the said impeller to deliver the impelled fluid, andgrooves in said innerv side surface assisting the passage of fibrous andother matters.

adapted to close laterally at least one side thereof, a

' 8. A centrifugal pump comprising in combination an impeller of diskform with backwardly curved blades of resilient material projecting fromat least one side thereof, a casing having at least one inner sidesurface the passages between the said blades co-acting with the saidimpeller to deliver the impelled fluid, and grooves in said inner sidesurface assisting the passage of fibrous and other matters. a

9. A centrifugal pumpcomprising in combination an impeller of disk formwith blades of resilient material casing having at least one inner sidesurface adapted to close laterally the passages between the said bladesco-acting with the said impeller to deliver elled fluid while per projecting from grooves in said inner side surface assisting the passage offibrous'and other matters.

11. A centrifugal pump comprising -in combination a casing, rooves insaid casing said grooves bein in t e direction of flow of fluid throughsai pump, an impeller in said casing, vanes carried by said impeller andhaving a resilient surface engaging the part of the casingcontaining'said grooves.

12. A centrifugal pump comprising in combination a casing having aninterior surface with grooves therein, an impeller in said casing andresilient vanes on said impeller engaging the surface of said casinghaving the grooves therein.

13. A centrifugal pump comprising in combination a casing having aninner surface, an impeller in said casing having vanes with a resilientsurface bearing against the

